subscripted, refers to the more volatile component.

y*

Equilibrium mole fraction of more volatile component in the vapor.

Z Characteristic length in the weep rate equation, defined by Eq.

Z Characteristic length in the weep rate equation, defined by Eq.

7.4.2 Greek letters a Relative volatility.

(i> Tray aeration factor in pressure drop equation, Eq. (6.47a).

T| Factor used in the Chan and Fair tray efficiency correlation, de fined by Eq. (7.25).

T| Factor used in froth density correlation, defined by Eq. (6.64).

\ Ratio of the slope of the equilibrium curve to the slope of the com ponent balance line, defined by the Eq. (7.5).

(j. Liquid viscosity, cP [Note: In Fig. 6.24 and in Eq. (6.54) only, vis cosity has the units of lb/ft-s].

p Density, lb/ft3.

Ph2o Density of liquid water at 60°F, 62.4 lb/ft3. pM Molar density, lb-mole/fts.

pvm Valve metal density, lb/ft3. «7 Surface tension, dyne/cm.

<J> Froth density.

x Parameter used in liquid entrainment calculation, defined by Eq.

i|< Entrainment, defined by Eq. (6.30), lb-mole of liquid entrained/lb-

mole of liquid flow on the tray.

7.4.3 Subscripts

B Based on bubbling area b Column bottom c Clear liquid

CBP At closed balance point of valve tray {Sec. 6.3.2)

D Distillate d Dry da Downcomer apron dc Downcomer dry Uncorrected for effects of weeping and entrainment (used to subscript Murphree tray efficiency).

f Froth flood At the flood point

G,g Vapor h Hole

HK Heavy key component i At the interface i Component counter [Eq. (7.40)]

j Component counter

L,l Liquid

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